//
//  UIImage+image.m
//
//
//  Created by ZHM on 14/12/31.
//  Copyright © 2014年 ZHM. All rights reserved.
//

#import "UIImage+image.h"

@implementation UIImage (image)

+ (instancetype)imageWithOriginalName:(NSString *)imageName {
    
    UIImage *image = [UIImage imageNamed:imageName];
    //设置图片渲染模式
    return [image imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
}

+ (instancetype)imageWithStretchableName:(NSString *)imageName
{
    UIImage *image = [UIImage imageNamed:imageName];
    return [image stretchableImageWithLeftCapWidth:image.size.width * 0.5 topCapHeight:image.size.height * 0.5];
}
- (UIImage *)imageCompressWithSimple:(UIImage *)image scaledToSize:(CGSize)size
{
    UIGraphicsBeginImageContext(size);
    [image drawInRect:CGRectMake(0,0,size.width,size.height)];
    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return newImage;
}

- (UIImage *)imageCompressWithSimple:(UIImage *)image scale:(float)scale
{
    
    CGSize size = image.size;
    CGFloat width=size.width;
    CGFloat height=size.height;
    

    
    CGFloat scaledWidth=width*scale;
    CGFloat scaledHeight=height*scale;
    UIGraphicsBeginImageContext(CGSizeMake(scaledWidth, scaledHeight));
    [image drawInRect:CGRectMake(0,0,scaledWidth,scaledHeight)];
    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return newImage;
}

- (UIImage*)imageByScalingAndCroppingForSize:(CGSize)targetSize
{
    
    UIImage *sourceImage = [UIImage imageNamed:@"test.jpg"];
    UIImage *newImage = nil;
    CGSize imageSize = sourceImage.size;
    CGFloat width = imageSize.width;
    CGFloat height = imageSize.height;
    CGFloat targetWidth = targetSize.width;
    CGFloat targetHeight = targetSize.height;
    CGFloat scaleFactor = 0.0;
    CGFloat scaledWidth = targetWidth;
    CGFloat scaledHeight = targetHeight;
    CGPoint thumbnailPoint = CGPointMake(0.0,0.0);
    
    if (CGSizeEqualToSize(imageSize, targetSize) == NO)
    {
        CGFloat widthFactor = targetWidth / width;
        CGFloat heightFactor = targetHeight / height;
        if (widthFactor > heightFactor)
            scaleFactor = widthFactor; // scale to fit height
        else
            scaleFactor = heightFactor; // scale to fit width
        
        scaledWidth= width * scaleFactor;
        scaledHeight = height * scaleFactor;
        // center the image
        if (widthFactor > heightFactor)
        {
            thumbnailPoint.y = (targetHeight - scaledHeight) * 0.5;
        }
        else if (widthFactor < heightFactor)
        {
            thumbnailPoint.x = (targetWidth - scaledWidth) * 0.5;
        }
    }
    
    UIGraphicsBeginImageContext(targetSize); // this will crop
    CGRect thumbnailRect = CGRectZero;
    thumbnailRect.origin = thumbnailPoint;
    thumbnailRect.size.width= scaledWidth;
    thumbnailRect.size.height = scaledHeight;
    [sourceImage drawInRect:thumbnailRect];
    newImage = UIGraphicsGetImageFromCurrentImageContext();
    
    if(newImage == nil)
        NSLog(@"could not scale image");

    UIGraphicsEndImageContext();
    
    return newImage;
}

@end
